/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.iotdb.tsfile.read.filter.operator;

import org.apache.iotdb.tsfile.file.metadata.statistics.Statistics;
import org.apache.iotdb.tsfile.read.filter.basic.Filter;
import org.apache.iotdb.tsfile.read.filter.factory.FilterSerializeId;
import org.apache.iotdb.tsfile.read.filter.factory.FilterType;
import org.apache.iotdb.tsfile.utils.ReadWriteIOUtils;

import java.io.DataOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.*;

/**
 * in clause.
 *
 * @param <T> comparable data type
 */
public class In<T extends Comparable<T>> implements Filter {

    private static final long serialVersionUID = 8572705136773595399L;

    protected Set<T> values;

    protected boolean not;

    protected FilterType filterType;

    public In() {
    }

    public In(Set<T> values, FilterType filterType, boolean not) {
        this.values = values;
        this.filterType = filterType;
        this.not = not;
    }

    @Override
    public boolean satisfy(Statistics statistics) {
        return true;
    }

    @Override
    public boolean satisfy(long time, Object value) {
        Object v = filterType == FilterType.TIME_FILTER ? time : value;
        return this.values.contains(v) != not;
    }

    @Override
    public boolean satisfyStartEndTime(long startTime, long endTime) {
        return true;
    }

    @Override
    public boolean containStartEndTime(long startTime, long endTime) {
        return true;
    }

    @Override
    public Filter copy() {
        return new In(new HashSet(values), filterType, not);
    }

    @Override
    public void serialize(DataOutputStream outputStream) {
        try {
            outputStream.write(getSerializeId().ordinal());
            outputStream.write(filterType.ordinal());
            ReadWriteIOUtils.write(not, outputStream);
            ReadWriteIOUtils.write(values.size(), outputStream);
            for (T value : values) {
                ReadWriteIOUtils.writeObject(value, outputStream);
            }
        } catch (IOException ignored) {
            // ignored
        }
    }

    @Override
    public void deserialize(ByteBuffer buffer) {
        filterType = FilterType.values()[buffer.get()];
        not = ReadWriteIOUtils.readBool(buffer);
        int size = ReadWriteIOUtils.readInt(buffer);
        values = new HashSet<>(size);
        for (int i = 0; i < size; i++) {
            values.add((T) ReadWriteIOUtils.readObject(buffer));
        }
    }

    @Override
    public boolean equals(Object o) {
        return o instanceof In
                && ((In<?>) o).filterType == filterType
                && ((In<?>) o).values.equals(values)
                && ((In<?>) o).not == not;
    }

    @Override
    public String toString() {
        List<T> valueList = new ArrayList<>(values);
        Collections.sort(valueList);
        return filterType + " < " + "reverse: " + not + ", " + valueList;
    }

    @Override
    public FilterSerializeId getSerializeId() {
        return FilterSerializeId.IN;
    }

    public Set<T> getValues() {
        return values;
    }
}
